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US 5,116,172 AGranted
Composite rotary cutting tool and adaptor and method of making same
AssigneePrecision Twist Drill Co.
InventorPaul E. Koster
Life of this patent
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AssigneePrecision Twist Drill Co.
InventorPaul E. Koster
Estimating the term…
A composite rotary cutting tool and adaptor includes a straight cutting tool, such as a drill bit or the like, having a cylindrical shank adhesively bonded within a close fitting axial bore in an adaptor or gripping member which has an outer circumferential gripping surface larger than the cutting tool shank. The cutting tool shank has at least one helical channel or groove formed therein so as to maintain a substantial portion of the original cylindrical surface area. The adaptor is hardened in a manner to prevent scale formation in the bore, and an anaerobic adhesive is applied within the bore and along the shank and into the helical groove. The shank is inserted into the adaptor bore to effect full wetting between the interfacing surfaces. The assembly is then fixtured in a vertical orientation and heat cured so as to obtain a composite cutting tool and adaptor having high torque and low concentricity run-out and angularity error.
A composite cutting tool and adaptor for precision cutting metallic parts, said tool and adaptor comprising a metallic cutting tool having a cutting end and a generally cylindrical shank end, and an adaptor having a metallic body defining an external gripping surface and having an axial bore free from scale, said shank end of said cutting tool being disposed within said bore and establishing relatively small clearance peripherally of said shank end, said shank end having at least one spiral groove along a predetermined length thereof, and an anaerobic adhesive between the interfacing surfaces of said shank and the peripheral wall of said bore and filling said groove, said adhesive being cured to a hardened state so as to lock said shank end within said adaptor, said metallic cutting tool shank and said metallic body of said adaptor having metal ions which react with said anaerobic adhesive.
A method of making a composite cutting tool and adaptor for precision cutting metallic material wherein the cutting tool is made of metallic material and has a cutting end and a generally cylindrical shank end, and wherein the adaptor has a metallic body having an external gripping surface and an axial cylindrical bore, said method comprising the steps of;
A composite cutting tool and adaptor for precision cutting metallic parts comprising a metallic cutting tool having a cutting end and a generally cylindrical shank end, and an adaptor having a metallic body defining an external gripping surface and having an axial bore free from scale, said shank end having at least one spiral groove along a predetermined length thereof, said shank end of said cutting tool being disposed within said bore with an interference press fit therebetween, and an anaerobic adhesive between the interfacing surfaces of said shank and the peripheral wall of said bore and filling said groove, said adhesive being cured to a hardened state so as to lock the shank end within the adaptor.
Dependencies are inferred from the claim text.